Gina
Gina's a Negator and was the Union's number 10—she's actually the one who captured Andy over fifty years back, though she's harbored a crush on him ever since. She's 66 but claims to be forever 16, which tells you something about her relationship with aging. In reality, her face and arms show her age pretty heavily, but she keeps up a teenage appearance through obsessive makeup application, which her ability lets her maintain constantly. Fans often note the contrast between her actual elderly features and the youthful mask she presents.
She's got a casual habit of nicknaming people—Andy's "Deady Dearest," Fuuko's "Lil' Lucky"—and generally comes across as someone who takes her work seriously. She's also notably flat-chested but has a large posterior, which she doesn't seem shy about.
The aging thing clearly bothers her more than she lets on. That obsession with staying young, the layers of makeup, the constant upkeep—it all points to someone dealing with some real gerascophobia, though she'd probably just laugh it off as vanity.
Content compiled by AnimeList.moe from publicly available sources.